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Thread: Our Experiment: Why does LIGO use Quadruple Pendulums to detect Gravitational Waves?

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    Default Our Experiment: Why does LIGO use Quadruple Pendulums to detect Gravitational Waves?



    Dear All,

    A few months ago, we attended a lecture by Dr. Rainer Weiss (2017 Nobel Prize Winner for Physics) at the Ontario Science Centre, Toronto.

    The lecture was about his work with the Laser Interferometer Gravitational-Wave Observatory (LIGO) for detecting gravitational waves. In his lecture. Dr. Weiss talked about quadruple pendulums or four pendulums stacked one below the other. LIGO uses such pendulums to isolate its mirrors from seismic vibrations.

    He encouraged the audience to make a quadruple pendulum using washers and strings to see for themselves how they worked. We took up this challenge and planned an experiment around it. The best way to learn science is by doing an experiment.

    The hypothesis we wanted to test was that for a range of frequencies, each pendulum in a quadruple pendulum vibrates less than the one above it.

    After multiple attempts, changing experiments and take thousands of data points (over 45,000) we finally realized the effectiveness of Quadruple Pendulums and why LIGO uses them.

    Our experiment involved attaching accelerometers to each of the stacked pendulums and having them broadcast live data wirelessly to the receivers. We experimented with a range of frequencies by inducing vibrations from corded and cordless drills.

    Here is the report on our experiment and the results we got:
    https://hotpoprobot.com/2019/04/07/ligo/

    Best regards,
    Vikas Nath

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    Default Re: Our Experiment: Why does LIGO use Quadruple Pendulums to detect Gravitational Wav

    Congratulations on an excellent study!
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    Default Re: Our Experiment: Why does LIGO use Quadruple Pendulums to detect Gravitational Wav

    pendulums. Centuries old tech being used in cutting edge science. ironic and incredible.
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    Default Re: Our Experiment: Why does LIGO use Quadruple Pendulums to detect Gravitational Wav

    Update: On 22 May 2019, we gave a lecture on this subject: "Swinging to Stability: How does Quadruple Pendulum isolate LIGO from Seismic Vibrations?" at the Ontario Science Centre, Canada.

    The video of live data being gathered from the quadruple pendulum, how seismic vibrations are getting isolated, and explanation are available at:

    https://www.youtube.com/watch?time_c...&v=MqUEGlE84iU

    Best regards,
    Vikas Nath

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